In this mode, a single differential clock is used to supply
clocks to the sysclock, ddrclock and usbclock.
- CONFIG_SYS_CPC_REINIT_F
- This CONFIG is defined when the CPC is configured as SRAM at the
- time of U-Boot entry and is required to be re-initialized.
-
- Generic CPU options:
CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
CONFIG_SYS_FSL_DDR_ADDR
Freescale DDR memory-mapped register base.
- CONFIG_SYS_FSL_DDR_EMU
- Specify emulator support for DDR. Some DDR features such as
- deskew training are not available.
-
CONFIG_SYS_FSL_DDRC_GEN1
Freescale DDR1 controller.
CONFIG_SCSI) you must configure support for at
least one non-MTD partition type as well.
-- LBA48 Support
- CONFIG_LBA48
-
- Set this to enable support for disks larger than 137GB
- Also look at CONFIG_SYS_64BIT_LBA.
- Whithout these , LBA48 support uses 32bit variables and will 'only'
- support disks up to 2.1TB.
-
- CONFIG_SYS_64BIT_LBA:
- When enabled, makes the IDE subsystem use 64bit sector addresses.
- Default is 32bit.
-
- NETWORK Support (PCI):
CONFIG_E1000_SPI
Utility code for direct access to the SPI bus on Intel 8257x.
Supported are USB Keyboards and USB Floppy drives
(TEAC FD-05PUB).
- CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
- txfilltuning field in the EHCI controller on reset.
-
CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2
HW module registers.
the appropriate value in Hz.
- MMC Support:
- The MMC controller on the Intel PXA is supported. To
- enable this define CONFIG_MMC. The MMC can be
- accessed from the boot prompt by mapping the device
- to physical memory similar to flash. Command line is
- enabled with CONFIG_CMD_MMC. The MMC driver also works with
- the FAT fs. This is enabled with CONFIG_CMD_FAT.
-
CONFIG_SH_MMCIF
Support for Renesas on-chip MMCIF controller
will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
- CONFIG_SYS_SPD_BUS_NUM
-
- If defined, then this indicates the I2C bus number for DDR SPD.
- If not defined, then U-Boot assumes that SPD is on I2C bus 0.
-
CONFIG_SYS_RTC_BUS_NUM
If defined, then this indicates the I2C bus number for the RTC.
Enables support for FPGA family.
(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
- CONFIG_FPGA_COUNT
-
- Specify the number of FPGA devices to support.
-
CONFIG_SYS_FPGA_PROG_FEEDBACK
Enable printing of hash marks during FPGA configuration.
overwriting the architecture dependent default
settings.
-- Frame Buffer Address:
- CONFIG_FB_ADDR
-
- Define CONFIG_FB_ADDR if you want to use specific
- address for frame buffer. This is typically the case
- when using a graphics controller has separate video
- memory. U-Boot will then place the frame buffer at
- the given address instead of dynamically reserving it
- in system RAM by calling lcd_setmem(), which grabs
- the memory for the frame buffer depending on the
- configured panel size.
-
- Please see board_init_f function.
-
- Automatic software updates via TFTP server
CONFIG_UPDATE_TFTP
CONFIG_UPDATE_TFTP_CNT_MAX
Non-cached memory is only supported on 32-bit ARM at present.
-- CONFIG_SYS_BOOTM_LEN:
- Normally compressed uImages are limited to an
- uncompressed size of 8 MBytes. If this is not enough,
- you can define CONFIG_SYS_BOOTM_LEN in your board config file
- to adjust this setting to your needs.
-
- CONFIG_SYS_BOOTMAPSZ:
Maximum size of memory mapped by the startup code of
the Linux kernel; all data that must be processed by
CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
then the value in "bootm_size" will be used instead.
-- CONFIG_SYS_BOOT_RAMDISK_HIGH:
- Enable initrd_high functionality. If defined then the
- initrd_high feature is enabled and the bootm ramdisk subcommand
- is enabled.
-
- CONFIG_SYS_BOOT_GET_CMDLINE:
Enables allocating and saving kernel cmdline in space between
"bootm_low" and "bootm_low" + BOOTMAPSZ.
while unprotecting/erasing/programming. Please only enable
this option if you really know what you are doing.
-- CONFIG_ENV_MAX_ENTRIES
-
- Maximum number of entries in the hash table that is used
- internally to store the environment settings. The default
- setting is supposed to be generous and should work in most
- cases. This setting can be used to tune behaviour; see
- lib/hashtable.c for details.
-
- CONFIG_ENV_FLAGS_LIST_DEFAULT
- CONFIG_ENV_FLAGS_LIST_STATIC
Enable validation of the values given to environment variables when
one, specify here. Note that the value must resolve
to something your driver can deal with.
-- CONFIG_SYS_DDR_RAW_TIMING
- Get DDR timing information from other than SPD. Common with
- soldered DDR chips onboard without SPD. DDR raw timing
- parameters are extracted from datasheet and hard-coded into
- header files or board specific files.
-
- CONFIG_FSL_DDR_INTERACTIVE
Enable interactive DDR debugging. See doc/README.fsl-ddr.
- CONFIG_FSL_DDR_BIST
Enable built-in memory test for Freescale DDR controllers.
-- CONFIG_SYS_83XX_DDR_USES_CS0
- Only for 83xx systems. If specified, then DDR should
- be configured using CS0 and CS1 instead of CS2 and CS3.
-
- CONFIG_RMII
Enable RMII mode for all FECs.
Note that this is a global option, we can't
proper). Code that needs stage-specific behavior should check
this.
-- CONFIG_SYS_MPC85XX_NO_RESETVEC
- Only for 85xx systems. If this variable is specified, the section
- .resetvec is not kept and the section .bootpg is placed in the
- previous 4k of the .text section.
-
- CONFIG_ARCH_MAP_SYSMEM
Generally U-Boot (and in particular the md command) uses
effective address. It is therefore not necessary to regard
diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
loads - load S-Record file over serial line
loadb - load binary file over serial line (kermit mode)
+loadm - load binary blob from source address to destination address
md - memory display
mm - memory modify (auto-incrementing)
nm - memory modify (constant address)